 It may be either a microprocessor-based integrated controller or an external personal computer.This differs from the single-axis semi-automated tracking of a traditional clock-drive equatorial mount.The user can command the mount to point the telescope to the celestial coordinates that the user inputs, or to objects in a pre-programmed database including ones from the Messier catalogue, the New General Catalogue, and even major Solar System bodies (the Sun, Moon, and planets).